Police began investigating Dec. 23, when East Lyme police were told of a threat posted to a social media site. The threat read: "I've been bullied [too] long, after break East Lyme better be ready for the hail of bullets."

East Lyme police, state police and the FBI obtained several search warrants during the investigation, and executed one at McKenzie's home at 49 Cubles Drive, where they say they recovered evidence related to the threat.

Police also interviewed McKenzie and they said he admitted making the threat. Police said McKenzie acted alone and no other arrests are expected.

He was held on $25,000 bail and is scheduled to be arraigned Friday in Superior Court in New London.